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Review of the Investigations of Pulverized Coal Combustion … THERMAL SCIENCE: Year 2019, Vol Stefanović, P. Lj., et al.: Review of the Investigations of Pulverized Coal Combustion … THERMAL SCIENCE: Year 2019, Vol. 23, Suppl. 5, pp. S1611-S1626 S1611 REVIEW OF THE INVESTIGATIONS OF PULVERIZED COAL COMBUSTION PROCESSES IN LARGE POWER PLANTS IN LABORATORY FOR THERMAL ENGINEERING AND ENERGY – PART B by Predrag Lj. STEFANOVI]*, Dejan B. CVETINOVI], Zoran J. MARKOVI], Mili} D. ERI], Simeon N. OKA, and Branislav S. REPI] Vinča Institute of Nuclear Sciences, University of Belgrade, Belgrade, Serbia Review paper https://doi.org/10.2298/TSCI19S5611R Paper presents short review of research problems, applied methods for solving problems and main results obtained by the researchers in Laboratory for Ther- mal Engineering and Energy (LTE) of the "Vinča" Institute of Nuclear Sciences, Belgrade, Serbia dealing with pulverized coal combustion processes and tech- nologies for reduction of pollutions problems at thermal power plants in a period since 2000. The presented results were published in numerous studies realized for different users, Ph. D., Masters, and Specialist thesis, in international and domestic scientific journals and monographs, presented at numerous internation- al and domestic scientific conferences, etc. Presented research projects and re- sults of applied research projects realized at pulverized coal combustion thermal power plants clearly show that LTE team was involved in key activities of reha- bilitation and modernization, including implementation of best available technol- ogies for pollution reduction at thermal power plants, in the region of South East Europe. Keywords: pulverized coal, combustion, boiler, diagnostics, burner, slagging, modelling, thermal power plants, pollution reduction technologies Introduction Thermal power plants (TPP) on lignite and their technological systems in the South- Eastern Europe (SEE) countries are relatively old. In addition, since 1990, due to economy transition problems, local conflicts, war destructions and financial crisis, TPP in the SEE countries have been functioning under very difficult and specific exploitation conditions of disturbed and closed market, resulting in remarkable decrease in financial support for mainte- nance but with lot of exploitation problems. The problems of their life cycle extension, of capital repair, modernization, revitalization, introduction of new technologies especially to reduce pollution problems, and of building new capacities have been present since the 90’s of 20th century. Researchers in the LTE have seen an opportunity for new impulse in applied research in laboratory including mathematical modelling of flow, combustion, and heat trans- _____________ * Corresponding author, e-mail: [email protected] Stefanović, P. Lj., et al.: Review of the Investigations of Pulverized Coal Combustion … S1612 THERMAL SCIENCE: Year 2019, Vol. 23, Suppl. 5, pp. S1611-S1626 fer in real-scale pulverized coal (PC) furnaces and especially, testing of the processes and equipment at TPP. Since 2000 a lot of new measuring probes have been developed, instru- ments bought, and in house/international standard methods were accredited according to ISO/IEC 17025 for performing testing in the laboratory and on site at TPP (http://www.registar.ats.rs/predmet/294/). As a result, since 2001, various measurements have been performed (based on contract with: national public companies for power generation in Serbia, BiH, Greece, and International companies: Alstom, General Electric, Mitsubishi Hita- chi Power Systems Europe, MITSUI, Bilfinger Babcoock Borsig Steinmuller, Rafako, Hamon, Siemens, CMEC, etc. and regional companies Energoprojekt-Entel, Metka, Viaocel, Solergon, Termooprema, Feromont, ZK-Termochem, Euromontig, etc.) on TPP in SEE coun- tries including Greece, Turkey, Iran, and Germany: – more than 45 various testings of power plants (adjusting of boiler operating parameters, Acceptance – performance testings according to DIN 1942, EN-12952:15 ), – more than 10 determinations of specific heat consumption (heat rate) of power plant units (according to DIN 1942, EN-12952:15 and DIN 1943, IEC 953-2), – more than 7 testings with the aim to increase the boiler steam flow and unit power, – more than 9 low NOx combustion system testings, – more than 13 mill testings, and – more than 43 testings of electrostatic precipitator (ESP) and pollutants emission measure- ments. Success of applied research since 2000, was based on modern measuring equipment, multidisciplinary expert team highly skilled for work at laboratory and on site at TPP, accred- ited standard international measuring methods and especially on the expert knowledge gained in previous fundamental and applied laboratory investigations of the fuel characteristics and processes in pulverized lignite fired boilers of TPP in SEE that was highly recognized at the international level (see paper in this issue: Review of the Investigations of Pulverized Coal Combustion Processes in Large Power Plants in Laboratory LTE – Part A, by Branislav S. Repić, Predrag Lj. Stefanović, Srdjan V. Belošević, Nenad Dj. Crnomarković, and Simeon N. Oka). Paper presents short review of research problems, applied methods for solving prob- lems and main results obtained by the researchers in the LTE dealing with PC combustion processes and technologies for reduction of pollutions problems at TPP. Research of physical-chemical properties of coal, ashes, and slag Physical-chemical properties of coal Coal fired power plants are major sources of GHG, especially CO2 and for precise determination of the emitted quantities, carbon emission factor (CEF) [t C/GJ] of local, low quality lignite should be experimentally determined on representative samples. Based on new laboratory experimental methodology including ultimate, proximate coal analysis, and calcu- lations, correlation for net calorific value Qnet [kJ/kg] and CEF have been obtained for: Kolu- bara lignite [1, 2], lignite from open pit mine Drmno-Kostolac [3], lignite from open pit mine Borovica-Pljevlja [4], and lignite from open pit mine Bogutovo Selo Ugljevik [5]. Results of these applied research suggest that: a) low quality lignite in West Balkan region has lower net calorific value and higher CEF values than recommended by IPCC Guidelines for National Greenhouse Gas Inventories, Tier 1 method [1], b) using this methodology, for each open pit mine, based on representative lignite samples, regression correlation between CEF and net Stefanović, P. Lj., et al.: Review of the Investigations of Pulverized Coal Combustion … THERMAL SCIENCE: Year 2019, Vol. 23, Suppl. 5, pp. S1611-S1626 S1613 calorific value should be established, periodically checked and used for CO2 emission calcula- tions, and c) lignite with higher content of carbonates in a mineral matter (widely present in SEE region) has lower net calorific value and increased CEF value i.e. increased CO2 emis- sion during combustion of such coal, compared to same coal without carbonates due to endo- thermic calcination reaction of decomposition calcium-carbonate to calcium-oxide and CO2 at elevated temperature in the boiler. High variation of open pit mined lignite quality in SEE has significant negative in- fluence on combustion process, boiler efficiency, emission in air, slagging/fouling problems in the furnace/boiler, etc. [6]. Due to development and implementation of new technologies: on-line coal quality determination, selective mining, and homogenization of lignite, most of the combustion/exploitation problems in the boiler have been solved in developed countries. Applied research on methods for on-line coal quality determination has been started in Insti- tute Vinča in the 1976 [7]. Experimental results based on transmission radiation method with 241Am gama radiation source and detector with NaJ crystal for relative determination of ash content and capacitive method for moisture content determination, gave very good results but mostly due to security (radiation protection) problems for personal at TPP, implementation in practice was not achieved. Following successful implementation of these new technologies for lignite quality optimization in USA, Australia, Germany, and other developed countries, activities in PE Electric Power Industry of Serbia were increased since 2000. Once again, due to security (radiation protection) problems for personal at open pit mine, for on-line meas- urement of ash content, besides Transmission radiation method, lot of research had been fo- cused on natural radiation of coal/mineral matter [8, 9]. Based on measured gamma-ray spec- trum of 82 lignite samples from open pit mine Kolubara, activity concentrations of naturally occurring radionuclides: 235U, 238U, 226Ra, 210Pb, 232Uh, and 40K as determined, have shown that there is a negligible concentration of natural radionuclides. Assessed radiologic effects show that all calculated values of: radium equivalent activity Raeq [Bq/kg], external hazard index Hex [Bq/kg], external gamma absorbed dose rate D [nGy/h], and annual effective dose rate [mSv/h] were below international recommended limits and that there is no enhanced radiation hazard for the population (both, working, and public) living nearby the open pit mines. Based on measured data, following correlations were obtained: 238U [Bq/kg] = 1.2253 × Ash content [%] with correlation coefficient R2 = 0.6447 232Th [Bq/kg] = 0.7613 × Ash content [%] with correlation coefficient R2 = 0.8022 40K [Bq/kg] = 3.882 × Ash content [%] with correlation coefficient R2 = 0.6375 Integral natural gamma
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